# SDR UALA2009072302199

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 21, 2009
- Submitted: July 29, 2009
- Operation: Air carrier
- Aircraft: N596UA
- Make and model: Boeing 757222
- Aircraft serial: 28749
- Aircraft time: 45,408 hours, 12,606 cycles
- Engine: Pwa PW2037
- System (JASC): [7532 · Compressor Bleed Valve](https://openairdocs.org/jasc/7532)
- Part: Bleed Valve
- Part number: 32144882
- Part serial: 59
- Condition: Faulty
- Location: Left
- Stage of operation: DE
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UALA2009072302199

## Discrepancy

LEFT BLEED AIR PRESS FLUCTUATING FROM 20 TO 40 PSI DURING DESCENT.  TROUBLESHOT PER MM.  UNABLE TO DETECT ANY FAILURE MODES.  REPLACED PRSOV AS A PRECAUTION.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.